DREW CAN'T COMMIT

"50 FIRST DATES" star Drew Barrymore has dealt a crushing blow to longtime boyfriend Fabrizio Moretti -- refusing to set a date for their wedding.

The "Charlie's Angels" beauty is so obsessed with her own romantic disasters, she can't commit -- and now the relationship is in jeopardy, say sources.

"Drew is in love with Fab but she's frightened to death of getting married again and having it not work out," divulged a friend of the actress.

Drew herself recently confessed: "I so want a family. I feel like my boyfriend is the right person. But I don't want to make a mistake."

Fab, 23, a drummer with The Strokes rock band, hooked up with the actress in May 2002. He first popped the question to Drew just four months into the relationship -- and Drew replied with an enthusiastic, "Yes, yes! Absolutely!" according to the friend.

But then she refused to set a date -- and just recently Fab asked her for the third time, hoping she'd have a change of heart.

The 29-year-old actress stung him by saying no.

"She sees very clearly the mistakes she's made in previous relationships," explained an insider.

When she was 17, Drew got engaged to actor Jamie Walters. Five months later, the relationship flamed out.

Two years later, she wed bar owner Jeremy Thomas -- just hours after proposing to him. But after 19 days, they separated and a divorce soon followed. In 2001, she married gross-out comedian Tom Green. That union lasted a mere five months.

On top of those disasters, Drew's own fractured family has left profound scars on the actress. Her father was an alcoholic and split with Drew's mom before Drew was born.

But now there's tremendous pressure on Drew because Fab is telling her he's not sure if he can continue the relationship without a permanent commitment.

Caught in an emotional tug-of-war, Drew said she'd reconsider this summer -- and she is seeking guidance from her good pal Cameron Diaz, say sources.

"Cameron is supportive of Drew and is telling her to go with her gut. But she is also concerned for Drew," disclosed the friend.